/Engine/Source/Runtime/Experimental/GeometryCollectionEngine/Public/GeometryCollection/GeometryCollectionISMPoolComponent.h
Add a static mesh for a mesh group
bool BatchUpdateInstancesTransforms ( [FMeshGroupId](API\Runtime\GeometryCollectionEngine\GeometryCollection\UGeometryCollect-_3\FMeshGroupId) MeshGroupId, [FMeshId](API\Runtime\GeometryCollectionEngine\GeometryCollection\UGeometryCollect-_3\FMeshId) MeshId, int32 StartInstanceIndex, [TArrayView](API\Runtime\Core\Containers\TArrayView)< const FTransform > NewInstancesTransforms, bool bWorldSpace, bool bMarkRenderStateDirty, bool bTeleport )